Motor transmission



R E D N A X E L A F A MOTOR TRANSMISSION Filed Dec. 22, 1943 INVENTOR.4977/1/12 F. ,4; sxmvoee Patented Nov. 11, 1947 UNITED STATES PATENTOFFICE MOTOR TRANSMISSION Arthur F. Alexander, Cleveland, OhioApplication December 22, 1943, Serial No. 515,323

1 Claim.

Other objects and features of novelty will appear as I proceed with thedescription of that embodiment of the invention which, for the purposesof the present application, I have illustrated in the accompanyingdrawing, in which:

Fig. l is an end view of an electric motor and transmission assemblyembodying my invention, and

Fig. 2 is a longitudinal sectional View taken substantially on the line2-2 of Fig. 1.

In the drawing, Ill is a motor housing having an integral upwardlyextending arm H. The rotor I2 of the motor is carried upon a sleeve l3.At one end of the rotor this sleeve is mounted in a ball-bearing l4,while at the other end of the rotor the sleeve [3 is mounted upon aneedlebearing l5, supported by a power shaft IS. The latter shaft whichcorresponds in position to the conventional motor shaft, extends througha ball-bearing ll in one end of the motor housing, and is provided witha projecting extremity Hi from which power may be taken. The other endof shaft H5 extends through a bronze bushing 20, which thus forms abearing between the sleeve l3 and the shaft.

A screw 2! is threadably mounted in arm II and has a smooth endconstituting a pivotal mounting for a lever 22 which may be held invarious positions of adjustment by means of a clamping bolt 23 whichextends through a hole in the lever and through an arcuate slot 24 inthe arm ll. Clamping action may be exerted between the head of bolt 23,engaginglever 22, and a nut 25 which is threaded on the end of the boltand caused to engage a surface of arm II. For convenience inmanipulation nut 25 is preferably provided with a handle 26.

Near its pivot pin 2i lever 22 carries a stub shaft 21 which has aconstricted end threaded into the lever. A bushing 28, surrounding androtatably mounted upon shaft 21, constitutes the countershaft of thetransmission. A two step pulley 3i] and a three step pulley 3| aresecured to the countershaft 28 so as to rotate together. On a portion ofthe sleeve I3 projecting from the motor housing, I mount a two steppulley 32 identical with pulley 30 but turned end for end, while apulley 33 identical with pulley 3| but turned end for end is keyed tothe extremity of shaft it which projects beyond sleeve l3. The pulleysare preferably V pulleys, and a V belt 34 runs over pulleys 3B and 32while another V belt 35 runs over pulleys 3| and 33.

It is not essential that pulleys 38 and 32 be two step pulleys, and ifsingle step pulleys are employed in their stead the one on the sleeve 13may be located within the motor housing, which of course would then becut away to permit the belt 34 to pass. The pulley 30 On countershaft 28corresponding with pulley wwould of course be in the same vertical planeas the pulley within the housing and on the right hand side of the arm II.

The operation of the invention will be readily understood. By the meansdisclosed the rotor [2 of the motor will turn pulley 32 which willfunction through belt 3 to turn pulley 3E) and with it hollow crankshaft28. Pulley 3|, being fixed upon the countershaft, will turn, and throughbelt 35 will rotate pulley 33. The latter pulley, being keyed to shaftIt, will turn that shaft, and drive may be taken from the projecting endl3 thereof.

When it is desired to change the speed of the power shaft It theoperator loosens clamping nut 25 and swings lever 22 counterclockwise asviewed in Fig. 1, thereby loosening the belts 34 and 35. One or both ofthe belts may then be shifted readily to obtain a selected new speedratio, after which the lever 22 is swung clockwise to subject the beltsto proper tension and the clamping nut 25 is screwed up to lock thecountershaft in the operative position.

While in the drawing the plane through the two shafts Iii and 21 isshown inclined, it will be understood that it is quite within thepurview of the invention to so dispose shaft 21 that this plane will bevertical. It will also be apparent that for more powerful motors it maybe desirable to employ double or even triple belts with a consequentchange in the pulley design.

Having thus described my invention, I claim:

In combination, an electric motor having a housing and a rotor, a hollowshaft for said rotor, ,a power shaft within said hollow shaft rotatableindependently of the hollow shaft, a bracket on said housing, a leverpivoted on said bracket, a countershaft carried by said lever, a pair ofidentical reversed step pulleys mounted on said hollow shaft andcountershaft, and a second pair of identical reversed step pulleyscarried on said 3 4 countershaft and said power shaft, and a belt UNITEDSTATES PATENTS connecting the pulleys of each pair, whereby movement ofsaid lever in one direction will loosen Number Name Date said belts andpermit them to be shifted, and 2,283,153 Koch ay 1942 means for securingsaid lever in difierent posi- 5 2,235,441 Nelson 1941 tions of djustment1,854,018 Carlberg Apr. 12, 1932 1,809,512 Defrays June 9, 1931 ARTHUR,ALEXANDER 2,268,305 Reinhard Dec. 30, 1941 2,308,813 Johnson Jan. 19,1943 REFERENCES CITED 10 1,442,217 HDoubler Jan. 16, 1923 FOREIGNPATENTS The following references are of record in the Number CountryDate file this patent 242,601 Great Britain Sept. 15, 1925

